linux-ext4 - more blkdev_get and holder work

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Date:   Wed,  2 Aug 2023 17:41:19 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>
Cc:     Jan Kara <jack@...e.cz>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        Ryusuke Konishi <konishi.ryusuke@...il.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-block@...r.kernel.org
Subject: more blkdev_get and holder work

Hi all,

this series sits on top of the vfs.super branch in the VFS tree and does a
few closely related things:

  1) it also converts nilfs2 and btrfs to the new scheme where the file system
     only opens the block devices after we know that a new super_block was
     allocated.
  2) it then makes sure that for all file system openers the super_block is
     stored in bd_holder, and makes use of that fact in the mark_dead method
     so that it doesn't have to fall get_super and thus can also work on
     block devices that sb->s_bdev doesn't point to
  3) it then drops the fs-specific holder ops in ext4 and xfs and uses the
     generic fs_holder_ops there

A git tree is available here:

    git://git.infradead.org/users/hch/misc.git fs-holder-rework

Gitweb:

    http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/fs-holder-rework

Diffstat:
 fs/btrfs/super.c           |   67 ++++++++++++++++---------------------
 fs/btrfs/volumes.c         |    8 ++--
 fs/btrfs/volumes.h         |    2 -
 fs/ext4/super.c            |   18 +++-------
 fs/f2fs/super.c            |    7 +--
 fs/nilfs2/super.c          |   81 ++++++++++++++++-----------------------------
 fs/super.c                 |   44 ++++++++++++++++++------
 fs/xfs/xfs_super.c         |   32 +++++++----------
 include/linux/blkdev.h     |    2 +
 include/linux/fs_context.h |    2 +
 10 files changed, 126 insertions(+), 137 deletions(-)